The custodian shall transfer in an appropriate manner the custodial property to the minor or to the minor’s estate upon the earlier of the following:
(a) The minor’s attainment of 18 years of age unless the time of transfer of the custodial property to the minor is delayed under Section 3920.5 to a time after the time the minor attains the age of 18 years.
(b) The time specified in the transfer pursuant to Section 3909 if the time of transfer of the custodial property to the minor is delayed under Section 3920.5 to a time after the time the minor attains the age of 18 years.
(c) The minor’s death.